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Abstract

The Main Storage Early Fetch Return function described below provides a way for a fetch command to execute on the main storage cards ahead of older store command(s). Executing fetches ahead of stores minimizes the delay effect of the deeper command queue on fetch execution. The function also needs to guarantee that commands appear to execute in the order received. If a store command on the queue addresses the same location as fetch command, the conflict must be resolved. The data returned on the fetch must include the new data to be stored and not the stale data in the memory modules.

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English (United States)

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This is the abbreviated version, containing approximately
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Main Storage Early Fetch Return

The Main
Storage Early Fetch Return function described
below provides a way for a fetch command to execute on the main
storage cards ahead of older store command(s).
Executing fetches
ahead of stores minimizes the delay effect of the deeper command
queue on fetch execution. The function
also needs to guarantee that
commands appear to execute in the order received. If a store command
on the queue addresses the same location as fetch command, the
conflict must be resolved. The data
returned on the fetch must
include the new data to be stored and not the stale data in the
memory modules.

This
invention is contained in two logic segments.
o Logic to decide whether a fetch
command can bypass the store
commands present on the command queue.
o Logic selecting the next command to
execute.

The decision
to permit a fetch command to bypass store commands
is determined by whether the fetch address conflicts with the address
of any store commands preceding the fetch on the queue. If an
address conflict existed, the fetch command would have to wait for
the store command to complete. If an
address conflict does not
exist, the fetch command would be allowed to execute before the store
command. The address test will prevent
the fetch command from
returning stale data. The results of the
address test were noted
with the fetch commands in the queue as a flag.
For the purpose of
this description, the flag is called the BYPASS flag. The active
BYPASS flag could only be set for a fetch command. The next command
selection logic uses the BYPASS flag to perform the selection. The
store commands would also have another flag set to indicate the
command is one that can be bypassed by fetch commands. For the
purpose of this description, the flag is called the STORE flag. If
needed, the BYPASS flag test could be repeated as store commands
complete. This would allow fetch bypass
to be enabled later if the
address for the oldest store command was the one preventing the fetch
bypass. The store data in the data
buffer could also be used as a
source for the fetch rather than waiting for the store to complete.